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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 335.4 $ 318.1 $ 252.8
Loss from discontinued operations, net of tax 0.4 0.0 0.9
Adjustments to reconcile net income to net cash provided by operating activities—      
Provision for doubtful accounts 52.4 61.2 47.2
Provision for government, class action, and related settlements 0.0 0.0 7.5
Depreciation and amortization 183.8 172.6 139.7
Amortization of debt-related items 8.7 13.8 14.3
Loss on early extinguishment of debt 10.7 7.4 22.4
Equity in net income of nonconsolidated affiliates (8.0) (9.8) (8.7)
Distributions from nonconsolidated affiliates 8.6 8.5 7.7
Stock-based compensation 47.7 27.4 26.2
Deferred tax expense 75.6 132.9 127.1
Other, net 3.4 0.1 (0.6)
Changes in assets and liabilities, net of acquisitions—      
Accounts receivable (83.9) (127.5) (134.1)
Prepaid expenses and other assets (12.6) (3.3) (9.6)
Accounts payable 7.5 6.3 0.9
Accrued payroll 24.4 21.4 (0.9)
Other liabilities 3.7 11.8 13.8
Premium received on bond issuance 0.0 0.0 9.8
Premium paid on redemption of bonds 0.0 (5.8) (13.7)
Net cash used in operating activities of discontinued operations (0.6) (0.7) (0.7)
Total adjustments 321.4 316.3 248.3
Net cash provided by operating activities 657.2 634.4 502.0
Cash flows from investing activities:      
Acquisition of businesses, net of cash acquired (38.8) (48.1) (985.1)
Purchases of property and equipment (225.8) (177.7) (128.4)
Additions to capitalized software costs (19.2) (25.2) (28.1)
Proceeds from disposal of assets 12.3 23.9 4.0
Proceeds from sale of nonrestricted marketable securities 0.0 0.0 12.8
Purchases of restricted investments (8.5) (1.3) (7.1)
Net change in restricted cash (1.5) (15.1) 2.7
Other, net (3.0) (1.6) (1.1)
Net cash provided by investing activities of discontinued operations 0.0 0.1 0.5
Net cash used in investing activities (284.5) (245.0) (1,129.8)
Cash flows from financing activities:      
Principal borrowings on term loan facilities 0.0 0.0 250.0
Proceeds from bond issuance 0.0 0.0 1,400.0
Principal payments on debt, including pre-payments (129.9) (202.1) (597.4)
Borrowings on revolving credit facility 273.3 335.0 540.0
Payments on revolving credit facility (330.3) (313.0) (735.0)
Principal payments under capital lease obligations (15.3) (13.3) (11.0)
Debt amendment and issuance costs (3.1) 0.0 (31.9)
Repurchases of common stock, including fees and expenses (38.1) (65.6) (45.3)
Dividends paid on common stock (91.5) (83.8) (77.2)
Proceeds from exercising stock warrants 26.6 0.0 0.0
Distributions paid to noncontrolling interests of consolidated affiliates (51.9) (64.9) (54.4)
Taxes paid on behalf of employees for shares withheld (19.8) (11.6) (17.2)
Contributions from consolidated affiliates 20.8 3.5 3.0
Other, net 0.4 5.3 (0.9)
Net cash (used in) provided by financing activities (358.8) (410.5) 622.7
Increase (decrease) in cash and cash equivalents 13.9 (21.1) (5.1)
Cash and cash equivalents at beginning of year 40.5 61.6 66.7
Cash and cash equivalents at end of year 54.4 40.5 61.6
Supplemental cash flow information:      
Interest (150.5) (164.3) (121.4)
Income tax refunds 1.9 1.4 7.4
Income tax payments (96.4) (33.3) (16.8)
Supplemental schedule of noncash financing activities:      
Conversion of convertible debt 319.4 0.0 0.0
Preferred stock conversion $ 0.0 $ 0.0 $ 93.2